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Girdling Trees 11 Girdling Trees R Scorr JOHNSON AND JAMES H. LARUE wide variety of fruit species are girdled to in­ This time also corresponds to the period just before A crease their yields, improve set, enlarge fruit size, pit hardening. Girdling, done too early, may result in and advance maturity. Apples, grapes, olives, oranges, increased split pits. If, however, it is carried out too grapefruits, and peaches have responded in at least late, there will be little or no response. The cut one (but not necessarily all) of these areas. However, generally heals over within 6 to 8 weeks; in Califor­ numerous examples of no response or even of nega­ nia, it does not need to be protected with grafting tive effects exist. Girdling, therefore, must be used wax or fungicides. Usually gum is secreted from the cautiously under conditions where the effects are girdle. If done correctly, the callus tissue formed well understood. during healing will just fill the wound (fig. 11.2). If Girdling is performed by removing a strip of cut too deep, regrowth of callus tissue tends to be bark from around the trunk or base of each scaffold excessive. limb with a grape girdling knife (fig. 11.1). The cut is In California, girdling is common on peaches usually made ~ or 3/16 inch wid e and only as deep and nectarines ripening before mid-June. Typically, as the cambium layer (the area between the bark and the benefits include increased fruit size, advanced wood). This temporarily disrupts the downward flow maturity of 1 to 4 days, and reduced number of of carbohydrates in the phloem and apparently makes harvests necessary to pick all the fruit. Varietal them more available for fruit growth and develop­ response to this practice, however, is quite variable. ment. If the cut is not deep enough, the uninter­ Almost all early varieties show some response, sub­ rupted downward flow continues and the fruit will stantial in some and almost unnoticeable in others. not respond. Deeper cuts that penetrate past the Mid- and late -season varieties are typically not cambium into the xylem tissue disrupt the upward girdled for several reasons. First, the economic advan­ flow of water and nutrients, leading to severe stress tages of increased size and advanced maturity are not and even death of the limb or tree. To be effective, nearly as great during this time of the season. Fur­ the girdle must extend all the way around the limb thermore, with more time on the tree, these fruit with the two ends meeting or overlapping in a spiral generally size adequately anyway. Finally, many of pattern. Even if only a small section of bark is left, these varieties are adversely affected by girdling, enough phloem may remain to continue the down­ exhibiting fruit cracks and poor coloration. Gener­ ward flow of carbohydrates and the girdle will be ally, plums do not respond to girdling. ineffective. Among the negative results possible is an increase The practice is generally carried out on earl y in split pits. Some older and newer varieties are par­ maturing peach and nectarine trees from early to late ticularly sensitive to this. For the most part, standard April, corresponding to 4 to 6 weeks before harvest. varieties have much less tendency to split (splitting 60 Fig. 11.1. Astrip of scaffold limb bark being removed with a Fig. 11.2. A new girdle directly above a healed girdle from the grape-girdling knife. previous year. Note the callus tissue formed during healing. may be internal and not extend to the surface). There­ Girdling may be stressful to the tree. Nutrient fore, even though girdling increases the occurrence deficiency symptoms often appear on leaves shortly of this phenomenon, the percentage is low and not a after girdling, and many growers believe the life of big problem. the tree is shortened. To minimize these detrimental Growers have observed a decrease in fruit qual­ effects, treat trees carefully. Water, nutrient, disease, ity of some nectarine varieties on girdled trees. The and insect stresses should all be avoided, before and red color can be duller and not as glossy and surface after harvest. Trees younger than 4 years old should russeting may increase. Fruit shape, taste, and firnmess not be girdled and care should be taken that the cut can also be adversely affected under certain environ­ does not go deeper than the cambium. Tree death mental conditions. can occur if the tree is too young or if the cut is too deep. 61 .
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